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In this work, the phase equilibrium in the system Na+, K+, Mg2+//Cl-, NO3--H2O saturated with NaCl and the system Na+, Mg2+//Cl-, NO3--H2O ,which have not been reported yet,were investigited by isothermal method at 298K. The solubilities and the physico-chemical properties, such as denstities and conductivities, of the corresponding equilibrium solutions were determined too. Based on these works, author obtained phase diagrams, such as the dry salt diagram, the corresponding water diagram, the stereo phase diagram, chloride diagram and the physico- chemical properties-composition diagrams of the quinary system. The physico- chemical properties of equilibrium solutions change in law with different compositions.The dry salt phase diagram of the system Na+, Mg2+//Cl-, NO3--H2O consists of four crystallization fields(NaNO3、Mg(NO3)2?6H2O、MgCl2?6H2O and NaCl), five univariant curves and two invariant points. No complex salt are found in the system.The dry salt phase diagram of the system Na+, K+, Mg2+//Cl-, NO3--H2O saturated with NaCl at 298K consists of six crystallization fields corresponding to NaNO3+NaCl,KNO3+NaCl,KCl+NaCl,Mg(NO3)2?6H2O +NaCl,MgCl2?6H2O+NaCl and KCl?MgCl2?6H2O +NaCl, nine univariant curves and four invariant points.
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